Look carefully on the board itself. Sometimes the wire color codes are labeled right next to the connector. If not, there may be some other letter codes and these should match the ones on the thermostat.

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FIXED
I have a deal with this kind corporates sabotaging for 2-3 times a month fixing computers and monitors.
The circuit boards for many BRAND NEW household devices, PCs, Computer monitors, dehumidifiers etc. purposely designed to work a little bit after warranty period and die quietly
Heater EW7507EK fixing. (soldering required)
Step 1. Turn it over. Unscrew 2 screws on the bottom of the face side.
Step 2. Mark and Unplug 3 wires from heating element. Unscrew the metal cover from circuit board. Immediately you'll see small black cylinder (CAPACITOR 470mF x 35V). Retail cost about $1- $3
Check this - the top of this capacitor rounded, not flat. That is mean it was "quietly blowup" and electrolyte evaporate.

FIXED
I have a deal with this kind corporates sabotaging for 2-3 times a month fixing computers and monitors.
The circuit boards for many BRAND NEW household devices, PCs, Computer monitors, dehumidifiers etc. purposely designed to work a little bit after warranty period and die quietly
Heater EW7507EK fixing. (soldering required)
Step 1. Unscrew 2 screws on the bottom of the face side.
Step 2. Mark and Unplug 3 wires from heating element. Unscrew the metal cover from circuit board. Immediately you'll see small black cylinder (CAPACITOR 470mF x 35V). Retail cost about $1- $3
Check this - the top of this capacitor rounded, not flat. That is mean it was "quietly blowup" and electrolyte evaporate.
Step 3. solder new capacitor.
Enjoy
Ely
Boston